138608565 has 32 divisors (see below), whose sum is σ = 240299136. Its totient is φ = 67952640.

The previous prime is 138608551. The next prime is 138608579. The reversal of 138608565 is 565806831.

It is an interprime number because it is at equal distance from previous prime (138608551) and next prime (138608579).

It is not a de Polignac number, because 138608565 - 2⁶ = 138608501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4645 + ... + 17285.

It is an arithmetic number, because the mean of its divisors is an integer number (7509348).

Almost surely, 2^138608565 is an apocalyptic number.

138608565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138608565 is a deficient number, since it is larger than the sum of its proper divisors (101690571).

138608565 is a wasteful number, since it uses less digits than its factorization.

138608565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12709.

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 138608565 is about 11773.2138772724. The cubic root of 138608565 is about 517.5234370585.

The spelling of 138608565 in words is "one hundred thirty-eight million, six hundred eight thousand, five hundred sixty-five".